/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Sampling/MeshMapBaker.h
Set an a Triangle ID to UV Chart ID array for TargetMesh. If this is not set, then the baker will compute it as part ofBake(). SinceComputeUVCharts()is non-trivial, this method is intended to allow a client to externally cache the result of ComputeUVCharts to minimize the overhead per bake.
void SetTargetMeshUVCharts ( [TArray](API\Runtime\Core\Containers\TArray)< int32 > * UVChartsIn )